Valve for internal-combustion engines.



' R. P. PLINN,

VALVE FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED AUG. 16; 1913.

v Patented Jan. 5, 1 915 f Invefitor: y (g v A; Atty a lve block carried by and movable there with; a spring encirclin said stem, one end of said spring being a apted to seat adjacent the bearing for said stem, a spring cup slidably and rotatably mounted upon said stem, means on said stem for controlling and defining the movement of said cup upon said stem, and means carried by and movable with said cup and cooperating with. saidlast named means, and adapted to interlock,

'out in the claims hereto appended. v

Referring to the-drawings: Figure 1 is a sectional view of a portion of a cylinder head showing my improved valve applied thereto; Fig. 2 is a section on the line 2-2 of Fig. 1 ;-Fig. 3 is a detail view in elevation of the lower portion of the stem, illustrat ing the construction by which the spring cup is mounted upon said stem; Fig. 4 is a sectional view of 'the spring cup removed from the stem; and Fig. 5 is a bottom view of the stem with the spring cup in position to slide thereon.

Like letters refer to like parts throughout the several views, Y

In the embodiment of my invention shown in the drawings, it indicates a portion of the 7 cylinder head provided with a valve seat 6 and a bearing boss 0 about which is formed a spring seat as l. Cooperating with the valve seat I) is an ordinary puppet valveblock e, provided with a stem adapted to reciprocate in the bearing 0. lncircling the valve stem 7 and the bearing boss 1:, with one end thereof bearing upon the seat (Z, is a coil spring g which is normally placed under compression by a spring cup h, mounted upon and movable with the valve stem. f. lVhen the valve is assembled, the spring it has a normal tendency to expand and seat the valve, the valve stem f receiving a timely reciprocation from an eccentric rod, not showh, to open said valve against the ten sion of said spring. The construction heretofore described old and well known n thisart, and I make no claim of invention there'- to, as my invention relates to the particular manner of combining and assembling these parts to facilitate the mounting or removal of the cup it upon, or from, said stem f, with the objects above specified.

To permit a quick and convenient mounting of the spring cup'izf upon the stem 7, it

is necessary that saidc'up be adapted to sl e axially of said stem while holding the ten sion of the spring-and further compressing same, and when the cup reaches the desired position on the stem, to rotate slightly upon said stem to hold the compression of the spring so as to permit a slight further rotation of the cup while the expansive force of the spring is being held by the stem itself, to bring the interlocking means carried by the cup and thestcm into the operative relation and cause the cup to move axially of the stem under said spring to engage said interlocking means to prevent further movement of the cup except by and in accordance with the movements of the valve stem. To

permit the desired movement of the spring cup h, I provide the stem 7' with means adapted to control and define the movements of said spring cup, which means comprises the axially extending grooves 2', preferably two in number, arranged at diametrically opposite points on said stem 7', which grooves are open at the end of said stem and terminate in a circumferential channel 7', extending about said stem.

Extending from the channel 7' toward the end. of the stem 7, are the diametrically opposed recesses Z, forming the bearing'surfaces/c, 71: and Ir, adapted to be engaged by cooperating means carried by the spring cup 9 to prevent rcciprocatory movement or rotation of the said cup when the'valvc is assembled. Preferably I form two recesses 7:, arranged midway between the grooves i so as to secure the desired strength of material. The upper shoulder of the cir cuini'ercntial channel j serves as a stop to insure the proper positioning of the cooperating means carried by the cup 9 while the lower shoulder y" of the channel acts as a hea ing adapted to hold the tension of the spring upon a slight return movement ofthe cup so as to permit the further partial rotation thereof while the valve stem is preventing expansion of said spring.

The cooperating means above referred to,

carried by the spring cup h comprisesthe diametrically opposite tongues m, carried upon .the innerlface of the boron of said spring cup, which tongues are adapted to have a sliding fit with the grooves 1 channel 7' and recesses 7.: respectively. f

The operation of the herein described val c is substantially as follows: In assembling the device, the valve stem is inserted in its bearing in the boss 0, and the valve block (I is permitted to seat upon its seat I). The spring 7 is then mounted about the stem and the cup 71. brought bclowthc. valve stem with the tongues m alincd with the grooves 1 axially of said stem f, the tongues m guid ing and defining its movement through their engagement with the groovcs i. at the same time steadying the cup. When said tongues m contact with the upper shoulder of the channclj, the compres ion of the spring will" be great. and to facilitate the locking of the cup in position, it is first turned slightlyso .Thc said cup is then forced and the tension of the spring will be held by said stein during said rotary movement of said cup and will act to prevent the disengagement of said tongues from said re- 4. A valve for internal combustion engines, embodying therein a reciprocatory 'valve stem, a valve block carried by and movable therewith, a spring encircling said 1o stem, one end of said spring being adapted to seat adjacent the bearing for said stem, a spring cup slidably and rotatably mounted upon said stem, said stem having therein diametrically opposite grooves, extending I15 axially, and opening at the end, thereof, di-.

ametrically opposite recesses spaced away from said grooves, a channel extending circumferentially and entirely about said stem and leading into said grooves and the tops 20 of said recesses, and'diametrically opposite about said recesses, and the tension of the.

spring will beheld by said stein during said rotary nmvement of said cup'and will act to prevent the disengagement of said tongues from said recesses.

' In witness whereof, I have hereunto affixed my signature, in the presence of two subscribing witnesses, this 15th day of August, 1913.

RICHARD 1 FLINN.

Witnesses:

FRANK 'l. Wnx'rwon'rn, Eneicxn 1mins. 

